/*
 * AopTargetUtils.java created on 2014年9月9日 下午8:47:41 by xie-qing
 */

package com.yzkj.cpjxc.business.framework.utils;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

import java.lang.reflect.Field;

/**
 * 获取动态代理的目标类
 */
public class AopTargetUtils {

	/** 
	 * 获取 目标对象 
	 * @param proxy 代理对象 
	 * @return  
	 * @throws Exception
	 */
	public static Object getTarget(Object proxy) throws Exception {

		if (!AopUtils.isAopProxy(proxy)) {
			return proxy;//不是代理对象  
		}

		if (AopUtils.isJdkDynamicProxy(proxy)) {
			return getJdkDynamicProxyTargetObject(proxy);
		} else { //cglib  
			return getCglibProxyTargetObject(proxy);
		}

	}

	private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
		Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
		h.setAccessible(true);
		Object dynamicAdvisedInterceptor = h.get(proxy);

		Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
		advised.setAccessible(true);

		Object target = ((AdvisedSupport) advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();

		return target;
	}

	private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
		Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
		h.setAccessible(true);
		AopProxy aopProxy = (AopProxy) h.get(proxy);

		Field advised = aopProxy.getClass().getDeclaredField("advised");
		advised.setAccessible(true);

		Object target = ((AdvisedSupport) advised.get(aopProxy)).getTargetSource().getTarget();

		return target;
	}

}
